starting resistance การใช้

• Control equipment shunted out starting resistances automatically as speed increased and current drawn fell.
• Control was through a 4-stage series-parallel controller with starting resistances, and some electric braking was provided by using the resistances.
• The metadyne system is more efficient than conventional starting resistances, particularly when the locomotive starts and stops frequently, or when it needs to run for long periods at slow speeds.
• Acceleration was smoother than on a train which switched starting resistances, and when braking the metadyne unit returned power to the tracks, which could be used by other trains if needed.
• Further notching out of the controller shorts out the starting resistances in pairs until in starting notch # 16 all of the starting resistances are shorted out; this corresponds to running notch # 3 on the engineer's controller.
• Further notching out of the controller shorts out the starting resistances in pairs until in starting notch # 16 all of the starting resistances are shorted out; this corresponds to running notch # 3 on the engineer's controller.
• After this the controller moves to starting notch # 13, which closes contactors # 1 and # 2 and opens both field-weakening contactors; this assembles 2 parallel circuits, each of which comprises 2 traction motors and a group of starting resistances connected in series and has a total resistance of 4.97 ohm.
• To coast, the engineer moves the controller handle to 0; this opens the line contactors, thereby shutting off all power to the traction motors, and moves the controller into starting notch # 1 ( therefore if the traction motors are turned on again, they are connected in series and all the starting resistances are in the circuit ).